package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

@Slf4j
@Component
public class RefreshTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // 1. 获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
//            // 不存在 拦截，返回401状态码
//            response.setStatus(401);
//            return false;
            return true;
        }
        // 2. 基于token获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash()
                .entries(LOGIN_USER_KEY + token);


        // 3. 判断用户是否存在
        if(userMap.isEmpty()){
            //不拦截，直接放行（拦截交给LoginInterceptor）
            return true;
//            // 4.不存在 拦截，返回401状态码
//            response.setStatus(401);
//            return false;
        }

        // 5. 将查询到的Hash数据转成UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        // 6. 存在，保存用户信息到 ThreadLocal
        UserHolder.saveUser(userDTO);

        // 7. 刷新token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token,LOGIN_USER_TTL, TimeUnit.SECONDS);

        log.info("用户已登录，id为 {}",UserHolder.getUser().toString());

        return true;


    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }

}
